package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    /**
     * 添加购物车
     * @param shoppingCartDTO
     *
     */
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    public void addShoppingCard(ShoppingCartDTO shoppingCartDTO) {
        //根据用户id 套餐id 菜品id 口味id 查询数据
        //需要用ShoppingCart 要拷贝
        ShoppingCart shoppingCart=new ShoppingCart();

        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        //如果存在直接number++
        if (list!=null&&list.size()>0){
            ShoppingCart shopping = list.get(0);
            shopping.setNumber(shopping.getNumber()+1);
            shoppingCartMapper.update(shopping);//update * set where id=**
        }else {
            //不存在直接插入
            //要判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                //本次添加是菜品
                Dish dish = dishMapper.getId(dishId);
               shoppingCart.setImage(dish.getImage());
               shoppingCart.setName(dish.getName());
               shoppingCart.setAmount(dish.getPrice());

            }else {
                //套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                //根据套餐id查询套餐
                Setmeal setmeal = setmealMapper.getBydId(setmealId);
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCar() {
        ShoppingCart shoppingCart=new ShoppingCart();
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
      List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCar() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.delete(userId);
    }

    /**
     * 删除一个商品
     * @param shoppingCartDTO
     */
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list!=null&&list.size()>0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number==1){
                //当前商品在购物车中份数为1直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不唯一修改份数
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.update(shoppingCart);
            }

        }


    }

}
